12-8 Care and Maintenance 
12.3  Check 
12.3.1  General Check 
  Table 12-5 The list for general check 
1. 
Probe 
a)  Visual estimation, check whether there are any cracks and distention to 
probe head. 
b)  Visual estimation, check whether there is aging or peeling; 
c)  Visual estimation, check whether there is the foreign matters or dirt to the 
probe’s connector.   
2. 
Power 
supply cable 
and socket
 
a)  Visual estimation, check whether there are creases, cracks or aging to 
the power supply cable; 
b)  Manual operation, check whether the plug of the power supply is fixed 
well. No loose or crack occurs. 
3. 
Manual operation, check whether the breaker works well. 
4. 
Battery 
Check battery performance periodically. 
a)  Check whether batteries can be charged upon power-on when AC power 
supply is connected: When the current battery capacity is 100% or the 
battery capacity increases after a period of time, it indicates that the 
battery can be charged. Usually, when the battery capacity is less than 
90%, it takes less than 5 minutes to increase the battery capacity by 1%. 
When the battery capacity is greater than 90%, it takes longer time. 
b)  In the standby status, the battery indicator should be on after AC power 
supply is disconnected. 
12.3.2  System Performance Check 
**It is an effective method to perform checks on product performance. It is necessary to select more. 
The routine maintenance is not required
**. 
Table 12-6 System function list 
No.  Item  Method 
1. 
B Mode 
Verify the basic operation in B mode. Check the basic 
software and hardware assembly which affect B-mode 
operation.
2. 
Color mode 
Check the basic operation in Color mode. Check the 
basic software and hardware assembly which affect 
3. 
Doppler mode (PW/CW)   
Verify basic operation in Doppler mode. Check the basic 
software and hardware assembly which affect Doppler